Cut-off relay for telephone-switchboards



(No Model.)

F R MoBERTY I GUT-OFF RELAY EoE TELEPHONE SWITGHBOARDS. ,No. 592,482.

Patented Oct. 26, 1897.

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UNITED STATES PATENT Ormcn.

FRANK R. MOBERTY, OF DOWVNERS GROVE, ILLINOIS, ASSIGN OR TO THE WESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS.

CUT-OFF RELAY FOR TELEPHONE-SWITCHBOARDS.

SPECIFICATION forming part of Letters Patent No. 592,432, dated October 26, 1897.

Application filed March 11, 1 8 9 '7.

To all whom it may concern:

Be it known that I, FRANK R. MOBERTY, a citizen of the United States, residing at Downers Grove, in the county of Du Page and State of Illinois, have invented a certain new and useful Improvement in Cut-Off Relays for Telephone-Switchboards, (Case No. 52,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

This invention concerns relays or electromagnetic switches for breaking two or, more circuits. Its aim is to produce a cheap and efficient appliance for this purpose. Itis designed especially for use in telephone-switchboards for severing the normal earth connections of telephone-lines when excited by current in circuits closed during the use of the line. 4

The invention consists in certain details of construction, among which are a novel arrangement of pole-pieces and the armature for producing an outward movement of the armature when the magnet is excited, a new mode of arranging and supporting the armature to maintain the magnetic circuit with but a single break, an arrangement of parts for communicating motion from the armature to the switch-springs designed to open the circuits, and other minor features which will be pointed out in the claims.

In constructing this relay a straight core having a suitable winding is furnished with bent pole-pieces extending toward each other parallel with the core of the magnet, and an armature is arranged adjacent to the inner faces of the pole-pieces and also parallel with the core. The armature is connected with one of the pole-pieces by a flexible strap or plate of iron and lies in contact with the strap, which itself lies in contact with the pole-piece, the other extremity of the armature being free to move toward the corresponding polepiece, but being normally withdrawn therefrom. The switch-springs are mounted parallel with the armature and are connected with it through the agency of insulatingpins. Suitably-supported contact-anvils are carried upon one of the pole-pieces to form resting-stops for the switch-springs. A tubu- Serial No. 626,941. (No model.)

lar covering is provided for the relay, together with means for supporting the cover reniovably upon the relay. This appliance is shown in the attached drawings, Wl1ereof Figure 1 is a side elevation, the cover being shown in section. Fig. 2 is a longitudinal central sectional View. Fig. 3 is a plan. Fig. 4 is a front elevation, the cover being removed.

The usual straight core a, of iron, carries heads I) and 1'), between which wire cis wound upon the core. At each extremity of the core pole-pieces d and d are fixed, their free extremities being extended toward each other and lying in the same plane. The armature 6 lies in the space between the spool and the inner faces of the pole-pieces. One extremity of the armature is connected with pole-piece (1 through aflexible strip 6, of iron, this strip being fixed to the armature and .to the polepiece at its extremities, respectively, by screws. The other extremity of the armature is free from the pole-piece d and normally rests at a short distance therefrom against a stop f. This stop is a screw passing through the pole-piece d and having a conical point which registers with the beveled extremity of armature e, the arrangement being thus adapted for the adjustment of the range of movement of the armature.

Two switch-springs g and g are provided, supported at their rear extremities between blocks h, of insulating material, secured to the pole-piece d by a screw passing therethrough. The forward extremities of the switch-springs rest upon con'ta'ct-anvilsiand 11, respectively, mounted on theterminals of contact-strips of similar designation, which also are carried between the blocks h. The armature 6 carries two studs 70 and 7c, of insulating material, which register with the two switch-springs g and g. These studs should be of such length that while the armature is in its lower position the studs separate to a slight distance from the springs g and g and permit these springs to rest firmly on their anvils 1; and t".

The excitement of the magnet causes the attraction of the free extremity of armature c to pole-piece 01, whereby studs 70 and 7e are thrust against the springs g and 9', respectively, and lift these springs from their contactanvils. Since the armature c is in continual magnetic contact with the pole-piece (Z, there being thus a single break in the magnetic circuit between the armature and the pole-piece (Z, this appliance operates with a high degree of ellicieney.

The electromagnet and its switch-contacts are mounted on a circular base Z, the terminals of the switch-springs g and g and of their anvils i and Z, and also of the winding 0, being led through openings in the plate Z, the space about the terminals beingililled with insulating material. Several of the plates Z may be mounted on a common support m, which is designed to be secured in a frame carrying a great number of relays. An object of the peculiar construction of this relay is that the appliance may occupy but little space laterally and that its switch-sprin and the parts for adjusting its armature may be accessible from the presented extremity when thus mounted with others in the frame.

The relay is inclosed in a cylindrical case a, which [its closely over the circular plate Z. The case is secured in place by means of a screw 0, passing outward through the polepiece (Z, and surrounded by a nut 17, screwed against the pole-piece, which serves as a distance-piece, together with a second nut on the screw 0 outside the case.

I claim as the invention 1. The combination with a straight core and the winding thereof, of pole-pieces for the core extending at right angles thereto and bending toward each other, an armature between the core and the pole-pieces overlapping the pole-pieces, a switch-spring parallelwiihthe armature outside the pole-pieces and a normal resting-anvil therefor, and a stud connecting the armature with the switchspring, substantially as described.

2. In combination in a reel angular magnetic circuit, a core with a winding thereon, pole pieces for the core extending toward each other, and an armature lying between the inner faces of the polepieces and the core and overlapping the pole-pieces, one extremity of the armature being connected with the corresponding pole-piece through a flexible strap of magnetic material, substantially as described.

23. In combination, a straight core, polepieces therefor extending at right angles thereto and having their extremities presented toward each other, an armature lying between the core and the inner faces of the pole-pieces and overlapping the pole-pieces, one extremity of the armature being secured to one of the pole-pieces by a flexible strap of iron, s\\"iteh-springs extending parallel with the armature and carried on the pole-piece which is connected with the armature, conteases taet-anvils for the other extremities of the springs, and studs upon the armature adapted to engage the switch-springs when the armature is attracted to raise them from their com tact-anvils, substantially as described.

4C. In combination, the core a and its mind ing, the pole-pieces (Z and (,Z, the armature a lying within the said polepieces, the anvil straps '2' and 11 secured to the pole-piece (Z and resting upon but insulated from the polepieee (Z, the switch-springs 9 and 7 secured to the pole-piece (Z and insulated therefrom and resting on the said anvils, and the studs 79 and 7c of insulating material on the armature adapted to engage the switch-springs to move them, as described.

5. The combination with the base-pl ate carrying several relays, of the core projecting at right angles thereto, the armature parallel with the core, pole-pieces for the core bent to overlap and inclose the extremities of the armature, a switch-spring parallel with the armature and a contact-anvil therefor, said. switch-spring being fixed near the base-plate and the movable extremity and contact-ptdnt thereof being presented near the other end of the magnet, as described.

6. The combination with the (-ore (Z and its winding, of pole-pieces (Z and (Z formed as shown, the armature a supported near the pole-piece (Z and the adjusting-screw f passing through pole-piece J and having a beveled extremity engaging said armature as a stop, substantially as described.

7. The combination with the core (I and its winding, polepie('es (Z and (Z, the armature (J and the flexible strap a of iron securing it to the pole-piece (Z, anvil-straps Z and 1 secured at their opposite extremities to pole-pieces (Z and cZ', respectively, by insulating niaterizll, the switch-springs g and g secured to polepiece (Z and insulated therefrom and resting on the said anvils Z and 1 and the studs and 7.; of insulating material carried by the armature andadapted to raise the switch-swings from their anvils when attracted, substantially as described,

8. In combination, the core (6 with its winding, the pole-pieces (Z and (Z, the armature the switch-springs controlled by the armature, the screw 0 and distance-piece carried on the pole-piece (Z, the circular base-plate 7L ilxed to pole-piece (Z, the cylindrical casing a inelosing the appliance and Olllbl'ftiiillg the plate ZL and the screw 1 retaining the casing in place, as described.

In witness whereof Iherennto subscribe my name this 12th day of l ebruary,1i. l). 185W.

FRANK R. ltlelllllt'lY.

Witnesses:

ELLA EnLEn, Lucien RUSSELL. 

